SOLUTION: Please help. I need to factor: (a + 4)^2 - 2(a + 4) + 1

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Question 330183: Please help. I need to factor:
(a + 4)^2 - 2(a + 4) + 1
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Use a substitution, let u=a%2B4
u%5E2-2u%2B1=%28u-1%29%5E2
%28a%2B4%29%5E2-2%28a%2B4%29%2B1=%28a%2B4-1%29%5E2
%28a%2B4%29%5E2-2%28a%2B4%29%2B1=%28a%2B3%29%5E2